package com.itheima.interceptor;

import com.alibaba.fastjson.JSONObject;
import com.itheima.pojo.Result;
import com.itheima.utils.JwtUtils;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
@Slf4j
@Component
public class LoginCheckInterceptor implements HandlerInterceptor {
    @Override //目标资源方法运行前运行，返回值为true放行,false拦截
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.获取请求url
        String url = request.getRequestURI().toString();
        log.info("请求url:{}", url);
        //2.判断请求url是否包含url，如果包含，说明是登录操作，放行
        if (url.contains("login")) {
            return true;
        }
        //3.获取请求头的令牌token
        String jwt = request.getHeader("token");
        //4.判断令牌是否存在，如果不存在，返回错误结果
        if(!StringUtils.hasLength(jwt)){
            log.info("请求头token为空，返回未登录的信息");
            Result error = Result.error("NOT_LOGIN");
            //手动将对象转换json格式
            String notLogin = JSONObject.toJSONString(error);
            response.getWriter().write(notLogin);
            return false;
        }
        //5.解析token,如果解析失败，返回错误结果（未登录）
        try {
            JwtUtils.parseJWT(jwt);
        } catch (Exception e) {
            e.printStackTrace();
            log.info("解析令牌失败，返回未登录错误信息");
            Result error = Result.error("NOT_LOGIN");
            //手动将对象转换json格式
            String notLogin = JSONObject.toJSONString(error);
            response.getWriter().write(notLogin);
            return false;
        }
        //6.放行
        log.info("令牌合法，放行");
        return true;
    }

    @Override //目标资源方法运行之后运行
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("posthandele ...");
    }

    @Override //视图渲染完毕后运行
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("aftercompletion ...");
    }
}
